Apple has released the iOS SDK 4.3 beta version to developers. One of new features is the enhanced multi-touch gesture support. The SDK 4.3 beta also offers "the ability to stream video to Apple TV using AirPlay, iAd full screen banners, and HTTP Live Streaming statistics."
According to Apple,

This beta release contains a preview of new Multi-Touch gestures for iPad. You can use four or five fingers to pinch to the Home Screen; swipe up to reveal the multitasking bar; and swipe left or right between apps. We are providing this preview before releasing them to the public to understand how these gestures work with your apps. Test them and give us your feedback on the Apple Developer Forums.